TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 342 of 481
TM 9-2320-272-10
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sonnel heater control box (5) to HI.
NOTE
Heater will not operate if switch is released from START posi-
tion before indicator lamp illuminates.
(6)
Hold RUN-OFF-START switch (8) on personnel heater control box (5) in
START position until indicator lamp (7) illuminates.
(7)
Move switch (8) from START to RUN, without hesitating at OFF, as
soon as indicator lamp (7) illuminates.
NOTE
• If heater fails to start, turn RUN-OFF-START switch to OFF
position and repeat steps 6 and 7. Notify your supervisor if
heater fails to start after two attempts.
• Heater blower motor switch on vehicle instrument panel is
not used for blower operation. HI-LO switch and RUN-OFF-
START switch on personnel heater control box are used in
place of blower motor switch.
(8)
Adjust hot air flow with heat vent control (3).
CAUTION
Heat cab before defrosting windshield. Glass damage may
result from sudden temperature changes.
(9)
Adjust defroster control (2) as required to defrost windshield. All heated
air is directed at windshield when defroster control (2) is pulled all the way out.
(10)
To shut down personnel heater:
(a)
Turn RUN-OFF-START switch (8) to OFF.
(b)
Remain in vehicle cab to make sure indicator lamp (7) goes out and
blower motor stops.
(c)
Close defroster control (2) and heat vent control (3).
(d)
Shut off engine. Refer to paragraph 2-16 for engine shutoff instruc-
tions.
(e)
Close electric fuel pump shutoff valve by turning valve lever (9) one-
quarter turn clockwise. Close two valves (10) for M939A2 series vehicles.
2-44. FUEL BURNING PERSONNEL HEATER KIT (Contd)
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